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authorUlrich Drepper <drepper@redhat.com>2005-12-14 15:06:39 +0000
committerUlrich Drepper <drepper@redhat.com>2005-12-14 15:06:39 +0000
commit9d13fb2413921c713f83efe331e8e4d219c62c6b (patch)
tree2d44d7ac45ab2d147eb8361bbff880c365aa8ad5 /math/w_log2f.c
parentb6ab06cef4670e02756bcdd4d2c33a49369a4346 (diff)
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Moved to csu/errno-loc.c.
Diffstat (limited to 'math/w_log2f.c')
-rw-r--r--math/w_log2f.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/math/w_log2f.c b/math/w_log2f.c
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--- /dev/null
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@@ -0,0 +1,30 @@
+/*
+ * wrapper log2(X)
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+float
+__log2f (float x) /* wrapper log2f */
+{
+#ifdef _IEEE_LIBM
+ return __ieee754_log2f (x);
+#else
+ float z;
+ z = __ieee754_log2f (x);
+ if (_LIB_VERSION == _IEEE_ || __isnanf (x)) return z;
+ if (x <= 0.0f)
+ {
+ if (x == 0.0f)
+ /* log2f (0) */
+ return __kernel_standard ((double) x, (double) x, 148);
+ else
+ /* log2f (x < 0) */
+ return __kernel_standard ((double) x, (double) x, 149);
+ }
+ else
+ return z;
+#endif
+}
+weak_alias (__log2f, log2f)